/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.bpmn.parser.handler;

import org.activiti.bpmn.model.BaseElement;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.ErrorEventDefinition;
import org.activiti.bpmn.model.EventDefinition;
import org.activiti.bpmn.model.EventSubProcess;
import org.activiti.bpmn.model.Message;
import org.activiti.bpmn.model.MessageEventDefinition;
import org.activiti.bpmn.model.StartEvent;
import org.activiti.engine.impl.bpmn.parser.BpmnParse;
import org.activiti.engine.impl.util.CollectionUtil;

/**
 */
public class StartEventParseHandler extends AbstractActivityBpmnParseHandler<StartEvent> {

	@Override
	public Class<? extends BaseElement> getHandledType() {
		return StartEvent.class;
	}

	@Override
	protected void executeParse(BpmnParse bpmnParse, StartEvent element) {
		if (element.getSubProcess() != null && element.getSubProcess() instanceof EventSubProcess) {
			if (CollectionUtil.isNotEmpty(element.getEventDefinitions())) {
				EventDefinition eventDefinition = element.getEventDefinitions().get(0);
				if (eventDefinition instanceof MessageEventDefinition) {
					MessageEventDefinition messageDefinition = (MessageEventDefinition) eventDefinition;
					BpmnModel bpmnModel = bpmnParse.getBpmnModel();
					String messageRef = messageDefinition.getMessageRef();
					if (bpmnModel.containsMessageId(messageRef)) {
						Message message = bpmnModel.getMessage(messageRef);
						messageDefinition.setMessageRef(message.getName());
						messageDefinition.setExtensionElements(message.getExtensionElements());
					}
					element.setBehavior(bpmnParse
							.getActivityBehaviorFactory()
							.createEventSubProcessMessageStartEventActivityBehavior(element, messageDefinition));

				} else if (eventDefinition instanceof ErrorEventDefinition) {
					element.setBehavior(bpmnParse
							.getActivityBehaviorFactory()
							.createEventSubProcessErrorStartEventActivityBehavior(element));
				}
			}

		} else if (CollectionUtil.isEmpty(element.getEventDefinitions())) {
			element.setBehavior(bpmnParse.getActivityBehaviorFactory().createNoneStartEventActivityBehavior(element));
		}

		if (element.getSubProcess() == null
				&& (CollectionUtil.isEmpty(element.getEventDefinitions()) || bpmnParse.getCurrentProcess().getInitialFlowElement() == null)) {
			bpmnParse.getCurrentProcess().setInitialFlowElement(element);
		}
	}

}
